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Stoa of Attalos Lining the east side of the Agora square is the Stoa of Attalos (Fig. 47), built during the reign of Attalos II of Pergamon (159–138 B.C.), who studied in Athens under the philosopher Karneades ... workrooms on the first floor ... Stoa of Attalos Lining ... square is the Stoa of Attalos